碩士 / 國立臺北大學 / 自然資源與環境管理研究所在職專班 / 102 / Desalination has many advantages, including short lead-time in planning and installation, and unaffected by variation of hydrological. It should then be considered as one of the options to tackle the future possible water shortage problem caused by climate change. But desalination process itself is an energy intensive process and may result in increasing emission of CO2, if the electricity used is fossil fuel based of power generation. Therefore, the purpose of the study will be focused on the feasibility of combining renewable power with the desalination process to explore its possible costs and benefits. Specifically, wind energy is considered as the source for power generation to substitute part of the fossil fuel (mainly coal) based electricity. Cost-benefit analysis is applied as the research method to identify as well as quantify various possible costs and benefits derived. It is estimated that the cost of wind power is about NT $0.17 to 1.70/KWh according to the effects of CO2 reduction and the reduction of air pollution.
A privately owned desalination unit combined with wind power generation unit under planning is used as the case for the cost-benefit analysis to calculate the investment returns and payback period. The results are as follows:
1.The capacity designed for the traditional desalination unit is 250 CMD. Based on actual operating record, the average electricity used for one ton of water produced is 4.7 KWh. With the additional variable and fixed costs taken into account, the water production cost is NT $41.97 per ton.
2.After 660KW wind power is added with the above stated water desalination units, only 73.8% of electricity used could be replaced by the desalination unit, due to the variability of wind resource and the capacity factor of 25.89%. After internalizing wind power environmental benefit, the cost saving from desalination can be 21.6%, compare with conventional desalination plant (from NT $41.97/ton down to $32.87/ton). This result obtained shows that there may exist a competitive advantage, and may contribute to the development of desalination, wind power-related industries, and consistent with the development policy of the National Renewable Energy.
3.By changing the scenario set for the BAU (Business As Usual) case, the study then performs a set of sensitivity analysis to show the resulting changes in net present values derived by the changes of the following parameters, which includes subsidies provided for purchasing wind power equipment, electricity price and water price. According to the sensitivity analysis and assuming that water demand is satisfied by importation of water from Taiwan, the cost generated will be about NT $160 per ton. It is because the quality of wind is higher, while the water resource is less abundant in the offshore islands, so the combined use of wind power and water desalination, the payback period will be shortened to 5 years. This scenario is therefore more preferred than the case of BAU scenario.
| Identifer | oai:union.ndltd.org:TW/102NTPU1399010 |
| Date | January 2014 |
| Creators | Kuo, Chang-Hsien, 郭章賢 |
| Contributors | Chang, Ssu-Li, 張四立 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 110 |
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